Rocky Mountain Research Station General Technical Report RMRS-GTR-21,
"Monitoring wilderness stream ecosystems," was first
published February 1999. It was recalled, and never distributed.
It has now been revised and published under a new number, RMRS-GTR-70.
Please make a note that RMRS-GTR-21 will not be printed, but
has been replaced with RMRS-GTR-70.